Question

1. which phrase describes a specific compound? 1

a. can contain only one element
b. can be physically separated into elements
c. is composed of elements chemically combined in a definite ratio
d. is composed of elements mixed in proportions that can vary

1. which type of chemical formula shows the arrangement of the atoms in a molecule? 1

a. empirical formula
b. general formula
c. molecular formula
d. structural formula

1. which terms identify the two different major categories of compounds? 1

a. covalent and molecular
b. covalent and thermal
c. ionic and molecular
d. ionic and thermal

Explanation:

Question 49

• Option a: A compound must have at least two elements, so a is wrong.
• Option b: Compounds are chemically combined, so physical separation isn't possible, b is wrong.
• Option c: By definition, a compound has elements chemically combined in a definite ratio, so c is correct.
• Option d: Mixtures have varying proportions, not compounds, d is wrong.

• Option a: Empirical formula gives the simplest ratio of atoms, not arrangement, a is wrong.
• Option b: General formula is for a class of compounds, not arrangement, b is wrong.
• Option c: Molecular formula gives the number of each atom, not arrangement, c is wrong.
• Option d: Structural formula shows the arrangement of atoms in a molecule, d is correct.

• Option a: Molecular compounds are a type, but covalent is a bond type, not a compound category, a is wrong.
• Option b: Thermal is not a compound category, b is wrong.
• Option c: The two major compound categories are ionic (formed by ionic bonds) and molecular (formed by covalent bonds), c is correct.
• Option d: Thermal is not a compound category, d is wrong.

Answer:

c. is composed of elements chemically combined in a definite ratio

Question 50